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IRIG Support Using Sun SPARC Audio - doc.ntp.org
http://doc.ntp.org/archives/3-5.93e/irig/
For example, the following two lines in the NTP configuration file ntp.conf are appropriate for the Spectracom Netclock/1 WWVB Synchronized Clock with IRIG Option: server 127.127.6.0 prefer minpoll 4 maxpoll 4 # irig audio decoder fudge 127.127.6.0 time1 0.0005
Appendix A. Audio IRIG Receiver Programming Information
http://doc.ntp.org/reflib/reports/fine/finec.pdf
(IRIG-B) timecode signal and the decoding of the signal to synchronize the local clock to the IRIG signal. The NTP Version 3 distribution supports the modified BSD driver when installed in the SunOS 4.1.x kernel. The IRIG receiver modifications are integrated in the BSD audio driver bsd_audio.c without
ConfiguringAudioRefclocks < Support < NTP
https://support.ntp.org/bin/view/Support/ConfiguringAudioRefclocks
The refclock config itself is a bit tricky. I've had to fuss around with the ntp.audio config here to get things going. Here's what I use for irig and wwv: # irig b (audio) # flag2 1 is line port, flag4 1 is verbose stats #server 127.127.6.0 version 4 #fudge 127.127.6.0 flag2 1 flag4 1 # wwv radio clock. time1 wwv, time2 wwvh, flag2 0=mike, 1=line.
IRIG Audio Decoder - Clock
http://www.clock.org/ntp/driver6.html
For ordinary audio applications, the audio driver is transparent; for use with the NTP driver, the audio driver decodes the IRIG audio signals and provides a timestamp, raw binary timecode, status byte and decoded ASCII timecode. The data are represented in the structure in the sys/bsd_audioirig.h header file:
Reference Clock Audio Drivers - doc.ntp.org
http://doc.ntp.org/archives/4.2.8-series/audio/
In such cases the audio signal can be connected via an ordinary sound card or baseboard audio codec. The suite of NTP reference clock drivers currently includes three drivers suitable for these applications. They include a driver for the Inter Range Instrumentation Group (IRIG) signals produced by many radio clocks and timing devices, another ...
Why You Should Use IRIG-B, Not NTP Server
https://affinityenergy.com/use-irig-b-not-ntp-server/
The importance of IRIG-B. IRIG-B exists because it’s deterministic. Once the signal is sent out from the clock, we know exactly how long it will take to arrive and be recognized by the pieces of equipment connected to the clock. In contrast is a common network protocol for synchronization of time called NTP – network time protocol.
IRIG-B To NTP/SNTP Time Code Converter - GPS Time Servers ...
https://www.synchbueno.com/products/time-code-converters-distributors/irig-b-to-ntp-sntp-time-code-converter.html?pname=IRIG-B%20To%20NTP/SNTP%20Time%20Code%20Converter
IRIG-B To NTP/SNTP Time Code Converter. SY-B-N-01 Irig-B to NTP Converter can transform IRIG-B to NTP/SNTP time code and finally to the server to synchronize the time. Time input: BNC or RS-485/422 block terminal. Time output: NTP/SNTP (RJ-45 connector IEEE 802.3 - shielded data line) & RS-232 (DB9 Connector)
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